68 lines
683 B
C++
68 lines
683 B
C++
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#include "stdafx.h"
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#include "defs.h"
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void
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eval_arctan(void)
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{
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push(cadr(p1));
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eval();
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arctan();
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}
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void
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arctan(void)
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{
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double d;
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save();
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p1 = pop();
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if (p1->k == DOUBLE) {
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errno = 0;
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d = atan(p1->u.d);
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if (errno)
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stop("arctan function error");
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push_double(d);
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restore();
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return;
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}
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if (iszero(p1)) {
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push(_zero);
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restore();
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return;
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}
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if (car(p1) == symbol(TAN)) {
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push(cadr(p1));
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restore();
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return;
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}
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push_symbol(ARCTAN);
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push(p1);
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list(2);
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restore();
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}
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static char *s[] = {
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"arctan(x)",
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"arctan(x)",
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"arctan(0)",
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"0",
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"arctan(tan(x))",
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"x",
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};
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void
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test_arctan(void)
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{
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test(__FILE__, s, sizeof s / sizeof (char *));
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}
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